Tell me what is this layer?
What is the layer that the red arrow is pointing to? And how do I get it like that? How is it different from a normal layer with a checkerboard pattern? I've tried many methods but still can't find the way I want. If I typed something wrong, I apologize. I just started using Photoshop for the first time a few weeks ago. Some of them don't look like chipping mask because some of them just have a + symbol behind them. It's a layer that has a small thumbnail in the layer that is the work we created. I don't know what it is.

